Beam quality: Beam currents were of the order of 30 nA.Target: The beam impinged on a 210-mkg/cm2-thick, self-supported natural silicon target.Data obtained: author graph (digitized with GSYS 2.4)Li beams were delivered by the TN11/25 HVEC 5.5 MV Tandem accelerator of the National Research Center of Greece-Demokritos.